<!DOCTYPE html>
html(lang="en")
  head
    meta(charset="UTF-8")
    meta(name="viewport", content="width=device-width, initial-scale=1.0")
    meta(http-equiv="X-UA-Compatible", content="ie=edge")
    title JADE测试页面
    style.
      * { padding: 0; margin: 0; }
      body { font-size: 14px; color: red; }
      div { background: #000; }
  body
    -var a =  0
    while a <= 12
      if a % 4 === 0 && a !== 0
        div.div #{a++}
      else
        div #{a++}